what i meant is that hitler might as well achieve those things before he ever decides to attack hitler?
not really a expert on world war 2 but i thought the germans were not that far from finishing the raf if they had decided to destroy all the airfields like they originally planned instead of starting to bomb london and the major cities into dust.
without the raf would the luftwaffe be able to destroy the royal navy?
the heer was also a large well equipped force as far as i am aware. would it be that hard for them to land a large force on british soil without the raf and royal navy?
once britain is taken care of i doubt any other country in the area would be able to stop germany from forming a powerful navy. although i am sure that the united states and canada would form large and technologically advanced navies in turn.
The question of how the Germans might have mounted an invasion of the British Isles has been raised frequently on this forum, to the point that most of the veterans regard it as done to death. If you go back to the main page, you'll see that there's a "Glossary of Sea Lion Threads" pinned at the top. You could get lost in there if you wanted to.
To give you a brief rundown of the general consensus, though, the feeling is as follows (and others may chime in to say they disagree on one or more points, but I'm trying to give the view of the majority here without getting into too much detail):
-- Britain's relative position in 1940 may not have been as weak as we initially thought, partly due to incorrect estimates of air strength;
-- the Luftwaffe didn't demonstrate anything like the anti-shipping capability necessary to cripple the RN, or at least to do so very quickly;
-- the Germans do not have a serious surface force capable of preventing the RN from interdicting the invasion fleet;
-- and, reasoning from there, any serious intervention by the RN will rapidly result in the total dispersal and/or destruction of the invasion fleet.
All of that leaving aside the question of how well British forces would have stood up to the invaders on land.
So, yes, it would be better for the Germans to finish off Britain before invading the Soviet Union. But in 1940 and especially in 1941, the Germans probably don't really have a feasible means of doing so.
What the outcome would be I can't begin to imagine at the moment, but the only feasible alternative that gets you where you want to go is to posit that Hitler adopts some sort of peace moves following either Dunkirk or a Sea Lion-style catastrophe. Say, a unilateral ceasefire. Then, he may not have to worry too much about Britain, the Americans might not enter the European war (especially if Hitler doesn't declare war on them), and Hitler can concentrate on beating the Soviets.
As for how workable that option is I don't know. Presumably it has been discussed here too before, but I'm not sure where.